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 ###Instrução: Qual é o Número de Famílias que possuem uma Renda Per Capita de $21,345?
 ###Tabelas: CREATE TABLE new_mexico_places_ranked_by_per_capita_income (new_mexico_places_ranked_by_per_capita_income_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Place VARCHAR, County VARCHAR, Per Capita Income VARCHAR, Median House- hold Income VARCHAR, Median Family Income VARCHAR, Population INT, Number of Households INT) CREATE TABLE world_championship_winners (world_championship_winners_id AUTO_INCREMENT PRIMARY KEY, Year INT, Location VARCHAR, Distance (miles) INT, Rider Names VARCHAR, Horse Name VARCHAR, Best-Conditioned Horse VARCHAR) CREATE TABLE administrative_divisions_regions_and_states (administrative_divisions_regions_and_states_id AUTO_INCREMENT PRIMARY KEY, No. INT, State/Region VARCHAR, Districts INT, Town ships INT, Cities/ Towns INT, Wards INT, Village groups INT, Villages INT) CREATE TABLE pga_tour_wins_7 (pga_tour_wins_7_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Tournament VARCHAR, Winning score VARCHAR, Margin of victory VARCHAR, Runner(s)-up VARCHAR) CREATE TABLE eesti_põlevkivi_jõhvi_in_estonian_football (eesti_põlevkivi_jõhvi_in_estonian_football_id AUTO_INCREMENT PRIMARY KEY, Year VARCHAR, League VARCHAR, Position INT, Goals +/- INT, Points INT)  
SELECT AVG Number of Households FROM new_mexico_places_ranked_by_per_capita_income WHERE Per Capita Income = $21,345